80728243 has 4 divisors (see below), whose sum is σ = 82605688. Its totient is φ = 78850800.

The previous prime is 80728231. The next prime is 80728253. The reversal of 80728243 is 34282708.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 80728243 - 2¹⁷ = 80597171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80728199 and 80728208.

It is not an unprimeable number, because it can be changed into a prime (80728253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938658 + ... + 938743.

It is an arithmetic number, because the mean of its divisors is an integer number (20651422).

Almost surely, 2^80728243 is an apocalyptic number.

80728243 is a deficient number, since it is larger than the sum of its proper divisors (1877445).

80728243 is a wasteful number, since it uses less digits than its factorization.

80728243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1877444.

The product of its (nonzero) digits is 21504, while the sum is 34.

The square root of 80728243 is about 8984.8897043870. The cubic root of 80728243 is about 432.1904506482.

The spelling of 80728243 in words is "eighty million, seven hundred twenty-eight thousand, two hundred forty-three".